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Have you tried re-installing the SP3 on the Exchange 2007 box?
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Have you tried re-installing the SP3 on the Exchange 2007 box?

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Another thing, has your Exchange 2007 server been restarted after SP3 was installed?
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Another thing, has your Exchange 2007 server been restarted after SP3 was installed?

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i have one exchange organization with exchange server 2007 sp3 i need to create one exchange server for another site forthat i am tryning to install exchange server 2010sp1<br />
but i am getting error message ike coexistance with older than exchange 2007 sp2 &nbsp;is not supported but we have sp3 running over there <a href="https://filedb.experts-exchange.com/incoming/2011/02_w08/410574/error.jpg" target="_blank" title="i have one exchange organization with exchange server 2007 sp3 i need to create one exchange server for another site forthat i am tryning to install exchange server 2010sp1 (157 KB)"><img alt="i have one exchange organization with exchange server 2007 sp3 i need to create one exchange server for another site forthat i am tryning to install exchange server 2010sp1" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2011/02_w08/800_410574/error.jpg" /></a>
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i have one exchange organization with exchange server 2007 sp3 i need to create one exchange server for another site forthat i am tryning to install exchange server 2010sp1

error.jpg

i have one exchange organization with exchange server 2007 sp3 i need to create one exchange server for another site forthat i am tryning to install exchange server 2010sp1
but i am getting error message ike coexistance with older than exchange 2007 sp2  is not supported but we have sp3 running over there 

exchange server 2010

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.